Based on the information available today, there have been 931,472 vote-by-mail ballots mailed. In the graphic representation of their daily counts data (which we'll update as new data arrives), we provide the daily raw counts of ballots that have been mailed, the daily count of the number of ballots that have been returned, and the cumulative totals by day.

As the OCRV notes on their website, these data are raw counts, and as such are daily estimates.

Here's our graphic that shows the main flows of ballots, which again, we will update as new data are available:

The Caltech/MIT Voting Technology Project (VTP) applies social science and engineering to voting. We are an interdisciplinary group that both conducts original research in this area and engages in an active program of outreach to the public and election officials.